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Code p0087

Kevin Hebert
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Niners 365 Enthusiast

Niners 365

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Posted

Not sure what your asking? Your question is veige. It was a common error code for loss of pressure in Fuel rail line. Attached is the skinny on it. 

Screenshot_20230523_105259_Google.jpg

newdude Senior Enthusiast

newdude

Posted
Posted

P0087 is not a good sign typically.  P0087 - Fuel Rail Pressure (FRP) Too Low.

 

Some "possible" indicators to causes that aren't the absolute worst:

 

P0087

Important: If the Change Fuel Filter Warning light is ON with DTC P0087, inspect the fuel filter for a restriction or contamination.

 

-A restricted, kinked, or damaged fuel supply line may cause DTC P0087 to set.

-If a low fuel condition is present and DTC P0087 sets, inspect the fuel sender pickup tube for damage or perforations.

-Water or gasoline contamination of the fuel may cause this DTC to intermittently set. Refer to Contaminants-in-Fuel Diagnosis.

-When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank.

-When power enhancing devices have been attached to the fuel rail pressure sensor circuits, this DTC may set and adversely affect the fuel system components.

-If the fuel pressure relief valve is not torqued correctly, the valve will leak fuel into the fuel return system causing this DTC to set. -The fuel pressure relief valve uses a bite type seal, and proper torque is essential for valve to rail sealing. Refer to Fastener -Tightening Specifications.

-High fuel injector return flow may cause this DTC to set.

-The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters may relate to driveability complaints.

 

 

What needs to be done however is a diesel fuel vacuum gauge needs to be installed at the injection pump to test if the injection pump is properly drawing fuel.  On 01-16 Duramaxes, the fuel injection pump pulls a vacuum on the fuel system.  There is no "lift pump" or low pressure side pump in the tank, unless an aftermarket one has been added (AirDog is a common brand or FASS).  

 

You should see 1–4 inches Hg vacuum when doing a gradual throttle sweep up to wide open.  Also, you need some sort of scanner or bi-directional scanner that can read fuel rail pressure.  

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